Ago Cadnel, Li Guowei, Wu Jiantao, Md Yusoff Nur Izzi
College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China.
Department of Civil Engineering, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia.
Polymers (Basel). 2023 Jul 18;15(14):3077. doi: 10.3390/polym15143077.
Hydrophobic aggregates have the great ability to prevent asphalt pavement roads from stripping-off of the asphalt in presence of water. In addition, they give the option to consume less asphalt and save cost. On the other hand, natural aggregates have been found to be non-renewable and rare. Geopolymer based artificial aggregates are great materials as they demonstrated to have exceptional features, such as high strength, superior durability, and greater resistance to fire exposure. In this study, a new hydrophobic geopolymer based aggregate has been produced with rice ash (RA) and fly ash as precursors as well as, Sodium Hydroxide (NaOH) and Sodium Silicate (NaSiO) as activators. The mechanical properties combined with the softening coefficient, surface properties of samples, contact angle and adhesion were characterized as well as microstructure X-ray diffraction (XRD) and Scanning electron microscopy (SEM) test. The results indicate that the activators NaSiO/NaOH at a mix ratio of 1 have a suitable effect on the pores and the compressive strength of the new artificial aggregate most particularly sodium hydroxide. Nonetheless, it has been found that coating the artificial aggregate with asphalt showed a great improvement of the hydrophobic nature of the produced artificial aggregate based geopolymer. Hence, indicates the possibility of using it as recycle aggregate pavement. From a microstructure point, the hydrophobic nature of the new alkali-activated artificial aggregate can be improved by increasing the quantity of mullite in the mix proportion design.
疏水聚集体具有很强的能力，可防止沥青路面在有水的情况下出现沥青剥落现象。此外，它们还能减少沥青用量并节省成本。另一方面，天然集料已被发现是不可再生且稀缺的。基于地质聚合物的人造集料是很好的材料，因为它们表现出卓越的特性，如高强度、优异的耐久性和更强的耐火性。在本研究中，以稻壳灰（RA）和粉煤灰为前驱体，氢氧化钠（NaOH）和硅酸钠（NaSiO）为活化剂，制备了一种新型的基于疏水地质聚合物的集料。对其力学性能、软化系数、样品表面性能、接触角和附着力进行了表征，并进行了微观结构X射线衍射（XRD）和扫描电子显微镜（SEM）测试。结果表明，混合比例为1的活化剂NaSiO/NaOH对新型人造集料的孔隙和抗压强度有合适的影响，尤其是氢氧化钠。尽管如此，已发现用沥青涂覆人造集料可显著改善所制备的基于地质聚合物的人造集料的疏水性。因此，表明了将其用作再生集料路面的可能性。从微观结构角度来看，通过在配合比设计中增加莫来石的含量，可以改善新型碱激活人造集料的疏水性。
